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Difference between revisions of "EclipseLink/UserGuide/JPA/Basic JPA Development/Entities/Ids/Generating and Configuring Entity Identities"
< EclipseLink | UserGuide | JPA | Basic JPA Development
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You can generate and/or configure the identity of your entities by using the following annotations: | You can generate and/or configure the identity of your entities by using the following annotations: | ||
− | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/ | + | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/Id|@Id]] |
− | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/ | + | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/IdClass|@IdClass]] |
− | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/ | + | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/EmbeddedId|@EmbeddedId]] |
− | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/ | + | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/GeneratedValue|@GeneratedValue]] |
− | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/ | + | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/TableGenerator|@TableGenerator]] |
− | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/ | + | *[[EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Entities/Ids/SequenceGenerator|@SequenceGenerator ]] |
You can also use these annotations to fine-tune how your database maintains the identity of your entities. | You can also use these annotations to fine-tune how your database maintains the identity of your entities. |
Revision as of 13:06, 8 April 2011
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Generating and Configuring Entity Identities
Every entity must have a persistent identity, which is an equivalent of a primary key in a database table that stores the entity state.
By default, the EclipseLink persistence provider assumes that each entity has at least one field or property that serves as a primary key.
You can generate and/or configure the identity of your entities by using the following annotations:
You can also use these annotations to fine-tune how your database maintains the identity of your entities.
Mapping | @Id | |
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